The recently released Fortnite 8.10 update brought a number of changes, including one applied to vending machines: they now offer free items, but they also explode.
Under the change, vending machines no longer have a material cost, instead giving players a single item for free.
After issuing that item, the machine explodes so that it can’t be used again.
This new exploit gets around that limitation in certain game modes.
Fortnite no longer has Common and Uncommon vending machine tiers, which means players get higher-tier loot from the machines they do find.
The downside is that you can no longer harvest max resources and then purchase multiple items from these machines.